Century V6-173 2.8L VIN W FI (1987)
If the governor pressure is okay, the 1-2 shift valve (331) may be stuck in the upshifted position. Remove the control valve assembly and check for a
sticking 1-2 shift valve (331), 1-2 throttle valve (332), or the 1-2 throttle valve spring (333) caused by the 1-2 throttle valve bushing retainer (390)
pushed in too far. The retainer should be installed flush with the machined surface of the valve body (Figure 2).
SERVICE MANUAL REFERENCE
Refer to the THM 440-T4 (ME9) Automatic Transaxle Unit Repair Section in the appropriate Service Manual.
SERVICE NOTES
For 1985 CP, CW or HT THM 440-T4 transaxle models, refer to Corporate Bulletin 857610.
